Study On The Low Temperature Performance Of Materials On The Upper Layer Of Highways In Different Temperature Areas

The asphalt and mixed material grade selection that exists in the winter low temperature on the upper layer of the highway has been highlighted according to few problems,it is generally believed that the normal temperature(20℃)below belongs to the low temperature category,and Yanqing Chongli Expressway is located in the winter cold zone,for the extremely low temperature climate.Above extreme low temperatures,the following temperatures are the low temperature areas that are usually considered to have an impact on the highway.In order to recommend the upper layer material(asphalt and mixture)of the highway of the low temperature temperature area and reasonably select the upper layer material of The Yanqing Chongli Expressway,this paper first carries out the partition of different low temperature temperature area,and secondly studies the performance of the low temperature material on the upper layer of the highway of the highway with different low temperature temperature area by indoor test method,and establishes the relationship between the asphalt technical index and the low temperature performance test index of the asphalt and mixture mixture.Then the selection basis of the material of the upper layer of the highway of the highway of the highway based on the asphalt technical index is given,that is,the material of the upper layer of the highway of the highway of different low temperature temperature area is recommended(including the recommendation of the material on the upper layer of the Yanqing Chongli Expressway),and finally the actual construction application of the recommended material on the upper layer of the Yanqing Chongli Expressway is used to verify it.The asphalt recommendation table based on the indoor test results of asphalt and mixture was obtained,and the test grade matching of the mixture under asphalt was compared,and the asphalt mixture recommendation table based on the indoor test results was obtained.The results show that: According to the asphalt recommendation table based on asphalt indoor test results,the recommended asphalt in each low temperature temperature area includes-the recommended extension of about 64 cm,the needle entry degree of about 9.4mm,the aging delay of about 56 cm asphalt;The recommended asphalt difference is great under the low temperature performance evaluation index of different mixtures,and the recommended asphalt in different low temperature temperature areas is also different,and for SMA-13 asphalt mixtures,the recommended asphalt is also different under the low temperature performance evaluation index of different mixtures,but the recommended asphalt in The A area is basically the same,are recommended extension of about 64 cm,injection degree is about 9.4mm,aging delay is about 56 cm indoor With the different mixing test indicators,the recommendations of the asphalt mixture on the upper layer of each low temperature temperature area highway are more or less different;the upper layer of Yanqing Chongli Expressway is suitable for choosing asphalt extension of about 64 cm,needle entry degree is about 9.4mm,the aging extension is about 56 cm,the grade is SMA-13 asphalt mixture;the theory recommends the specific application of the practical recommendation in The Yanqing Chongli Expressway.Further can prove the reference value of the above layer material of the highway in different low temperature temperature area.